I gathered a lot of birch bark for personal projects and courses while I was at home. Some is spirally cut and will be used for a rucksacks or shoes. This is a photo of some of it. All was gathered with stone tools.
This cup was made due to the need of a container to keep my worms in when fishing. This type of cup is readily made and discarded and can be used for drinking from too, but due to the simple fold it does not hold water perfectly.